/Engine/Source/Editor/DetailCustomizations/Public/KeyStructCustomization.h
Helper variant that generates the key struct in the header and appends a single button at the end TODO: Is there a better way?
void CustomizeHeaderOnlyWithButton ( [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< class [IPropertyHandle](API\Editor\PropertyEditor\IPropertyHandle) > StructPropertyHandle, class [FDetailWidgetRow](API\Editor\PropertyEditor\FDetailWidgetRow) & HeaderRow, [IPropertyTypeCustomizationUtils](API\Editor\PropertyEditor\IPropertyTypeCustomizationUtils) & StructCustomizationUtils, [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > Button )